Slush hydrogen is a mixture of solid hydrogen and liquid hydrogen.It can be used as the fuel of rocket and space booster compared with the liquid hydrogen due to the higher density and heat capacity.In the present study

a numerical model was built based on the Eulerian-Eulerian model and kinetic theory of granular flow to investigate the flow and heat transfer characteristics of slush hydrogen in a horizontal pipe.For different heat fluxes

flow velocities and particle diameters of the slush hydrogen

it was found that the temperature of fluid can be decreased while using slush hydrogen instead of liquid hydrogen so that the vaporization of liquid hydrogen can be suppressed.The increase of flow velocity can make the distribution of particle more uniform and enhance the average heat transfer coefficient of slush hydrogen along the tube.Small diameter particle can improve the heat transfer between the solid phase and liquid phase and the melting of slush hydrogen can be accelerated.